did president obama ever meet him? >> guest: no, he never met after the 1980's after his grandfather had died. aside from the very early days of his birth but he didn't get back to kenya until both of his grandparents were gone so there's a dramatic difference in that part of the story. >> for barack obama the story how many interviews did you do over the course of the last four years? >> guest: i would say almost 400, and i had a wonderful assistant who helped with some of the leader interviews in the story but i traveled all over the world and so everybody could find in every part of the life of president obama and his parents and grandparents. >> host: barack obama sr. was born in 1936. what was his childhood like? >> guest: from a fairly early age he was dealing with western culture in the british. he was a very smart kid. his father was difficult to get along with and was not often there mostly in the nairobi and he was growing up. he was lucky in the sense that he was smart enough to get into a very good school i